Prostrate Spurge - Identification & Control

Lawn Weed Identification & Control

Prostrate Spurge, also known as spotted spurge or creeping spurge (Chamaesyce maculata and Euphorbia supina), is a low-growing, mat-forming, summer annual.


  • Summer annual
  • Reproduces from seed every spring
  • Thrives in hot, sunny and dry sites
  • A white, milky sap oozes from the leaves, stems and roots
  • Has a deep taproot
  • A very prolific seeder

A common weed in newly established lawns or thin lawns, it thrives on harsh, sun-baked sites. I have observed spurge growing in hard compacted soils as well as cracks in sidewalks and asphalt parking lots.

The leaves have a red blotch in the center and reddish stems that ooze a milky sap when broken. It’s a vigorous plant that can grow up to three feet in diameter.

Prostrate Spurge Weed Id and Control in Lawns

The best weed control is always a healthy, well-managed lawn that will not allow weed seeds to germinate. Weed seeds need contact with soil, sunlight and moisture to germinate and grow. A dense, vigorous lawn will choke out weed seedlings before they become established.

prostrate spurge
prostrate spurge
prostrate spurge
prostrate spurge
prostrate spurge
Illustration courtesy of USDA-NRCS PLANTS Database / USDA NRCS. Wetland flora: Field office illustrated guide to plant species.

Improved lawn care practices, most commonly proper watering, mowing and fertilizing, will ensure your grass is healthy and vigorous while keeping spurge in check. It often appears in bare areas, dry spots, thin grass stands, and along the edges of sidewalks, curbs and driveways.

Hand weed when the soil is moist. It’s an easy weed to pull. Pulling from the center of the plant helps extract the taproot. Removing plants when they are young and before they produce seeds will keep spurge populations down. A single plant is capable of producing thousands of seeds throughout the growing season.

lawn weed pesticide

Pre-emergent herbicides can be used to keep seeds from germinating in the spring. Prostrate spurge seeds germinate when soil temperatures reach 60° F – generally by the end of April. One application will usually do the trick. Thin lawns or unusually wet weather might require a second application – spaced 60 days apart.

Broadleaf herbicides are most effective on spurge when the plants are young. Mature plants can be resistant to post-emergent herbicides. A product containing 2,4-D and other ingredients such as MCPP, MCPA, or Dicamba is recommended.

Vinegar-based (20% acetic acid) or Citric Acid herbicides – considered natural organic weed killers – can be used effectively in landscape beds, sidewalks and driveways. Spray them when they are young for best results. These herbicides are not selective – they will damage any foliage they come into contact with.

Weed Identification

Leaves are pale green, opposite along the stem, oval, and small – up to 3/5 inch long. Leaves form a purple blotch in the middle.

The prostrate stems form a dense mat that smothers desirable grass plants. Stems are green to red, branch freely and emit a poisonous milky sap when broken.

Flowers are very small and inconspicuous, they are borne on the leaf axils. Spurge starts to flower about three weeks after germinating.

Prostrate spurge is often confused with purslane or prostrate knotweed.

Purslane and spurge are often found growing together. Purslane flowers are yellow and it has fleshy stems and leaves.

Prostrate knotweed also forms a dense mat. However, knotweed has bluish-green leaves and does not emit a milky sap.

More weed identification:

Corn Speedwell (Veronica arvensis) is a low-growing winter annual and a common weed problem in thin turf stands and newly seeded lawns. Pictures to help with lawn weed identification and control.

Mouse-ear chickweed is a common lawn weed found throughout the United States. Its characteristics make it a competitive weed in lawns.

How to identify and manage Common Chickweed (Stellaria media), a winter annual lawn weed. Photos are included to help with weed ID and control. Lawn care tips and advice.

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